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Back out 56ec5e954858 (from bug 685783) due to a Dromaeo regression.

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This commit is contained in:
Nicholas Nethercote 2011-10-20 15:47:39 -07:00
parent 1a8ce6c37c
commit 0c4c3e74cb
1 changed files with 2 additions and 9 deletions
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11
js/public/Vector.h
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@ -560,7 +560,6 @@ Vector<T,N,AP>::calculateNewCapacity(size_t curLength, size_t lengthInc,
size_t &newCap)
{
size_t newMinCap = curLength + lengthInc;
size_t newMinSize = newMinCap * sizeof(T);
/*
* Check for overflow in the above addition, below CEILING_LOG2, and later
@ -572,14 +571,8 @@ Vector<T,N,AP>::calculateNewCapacity(size_t curLength, size_t lengthInc,
return false;
}
/*
* It's best to request 2^N sized chunks because they are unlikely to be
* rounded up by the allocator. (Asking for a 2^N number of elements isn't
* as good, because if sizeof(T) is not a power-of-two that would result in
* a non-2^N request size, which can cause waste.)
*/
size_t newSize = RoundUpPow2(newMinSize);
newCap = newSize / sizeof(T);
/* Round up to next power of 2. */
newCap = RoundUpPow2(newMinCap);
/*
* Do not allow a buffer large enough that the expression ((char *)end() -